We use Present Simple for:
* things in general or things that happen repeatedly;
e.g. (+) Water boils at 1000Celsius.
( - ) It doesn’t rain very much in summer.
( ? ) What do you usually do at weekends?
* a permanent situation;
e.g. (+) My parents live in London.
( - ) He is lazy. He doesn’t work very hard most of the time.
( ? ) What subjects do you learn at school?
We use Present Continuous for:
* something that is happening at or around the moment of speaking (the action is not finished);
e.g. (+) The water is boiling. Can you turn it off?
( - ) Let’s go out. It isn’t raining now.
( ? ) What are you doing in the kitchen, dad?
* a temporary situation;
e.g. (+) I am living with some friends until I find a flat.
( - ) “You are working very hard today.” “Yes, I’ve got a lot to do.”
( ? ) “What are you learning?” “Maths.”